My Coke Rewards has launched a Boxes of Joy game, where you can win a prize instantly. It costs one code to play, and it appears that, if you use the code to enter, you will not get points for that code. Skip the rip-off. Instead, see section 3b in the rules for a free entry. You can enter up to three times per day.
Don't have a Hilton Hhonors account? Sign up here and get 100 MCR points.